Channel Impulse Response Tap Selection for RF Object Tracking
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Solution Overview
Problem
Existing wireless communication systems lack efficient methods for accurately determining the location and movement of target objects using channel impulse responses (CIR) in radio frequency sensing.
Innovation Solution
The method involves estimating a CIR that represents signal reflections from objects as multiple taps, selecting taps within a specified time window, and transmitting a CIR report to identify the target object or its movement, while the initiating device aligns CIR reports across multiple packets to determine the object's location or movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel impulse response includes all signal reflections from objects, then measurement precision is improved, but device complexity increases due to processing large amounts of tap data
Solution Approach 1:
The patent extracts only the necessary tap information from the complete channel impulse response by selecting taps within a specific time window. This time-windowed extraction approach filters out irrelevant reflections while preserving those needed for accurate location identification, thereby reducing processing complexity without sacrificing measurement precision.
Solution Approach 2:
The patent segments the channel impulse response into discrete time windows, separating relevant signal reflections from irrelevant ones based on their arrival time. This segmentation allows the system to process only the pertinent portions of the CIR, reducing computational burden while maintaining location identification accuracy.
2Measurement precision
If time window for tap selection is extended, then measurement precision is improved by capturing more reflections, but loss of time increases due to extended processing window
Solution Approach 1:
The patent applies partial action by selecting only the necessary taps within an optimized time window rather than processing the entire CIR. The time window is configured to capture sufficient reflections for accurate object tracking while avoiding excessive extension that would increase processing time and reduce system responsiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise identification and tracking of target objects by leveraging CIR reports, enhancing the accuracy and efficiency of radio frequency sensing in wireless communication systems.
Implementation Method 1
estimating a channel impulse response (CIR) that represents signal reflections from one or more objects as multiple taps
Implementation Method 2
aligning, using one or more taps in the one or more CIR reports for each packet, the one or more CIR reports across the multiple packets to identify a target object, a location of the target object, or a movement of the target object
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a responding device may receive a signal from an initiating device. The responding device may estimate, from the signal, a channel impulse response (CIR) that represents signal reflections from one or more objects as multiple taps. The responding device may select one or more taps, from the multiple taps, that are within a first time window that starts at a first offset from a reference point and that has a first specified time duration. The responding device may transmit, to the initiating device, a CIR report that indicates the one or more taps. Numerous other aspects are described.